Re: [PATCH] fixup! signal: factor copy_siginfo_to_external32 from copy_siginfo_to_user32

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Apr 29, 2020 at 11:42 AM Christoph Hellwig <hch@xxxxxx> wrote:
>
> On Wed, Apr 29, 2020 at 10:07:11AM +0200, Arnd Bergmann wrote:
> > > What do you think of this version?  This one always overrides
> > > copy_siginfo_to_user32 for the x86 compat case to keep the churn down,
> > > and improves the copy_siginfo_to_external32 documentation a bit.
> >
> > Looks good to me. I preferred checking for X32 explicitly (so we can
> > find and kill off the #ifdef if we ever remove X32 for good), but there is
> > little difference in the end.
>
> Is there any realistic chance we'll get rid of x32?

When we discussed it last year, there were a couple of users that replied
saying they actively use it for a full system, and some others said they run
specific programs built as x32 as it results in much faster (10% to 20%)
execution of the same binaries compared to either i686 or x86_64.

I expect both of these to get less common over time as stuff bitrots
and more of the workloads that benefit most from the higher
performance (cross-compilers, hpc) run out of virtual address space.
Debian popcon numbers are too small to be reliable but they do show
a trend at https://popcon.debian.org/stat/sub-x32.png

I would just ask again every few years, and eventually we'll decide
it's not worth keeping any more. I do expect most 32-bit machines
to stop getting kernel updates before 2030 and we can probably
remove a bunch of architectures including x32 before then, though
at least armv7 users will have to get kernel updates for substantially
longer.

      Arnd



[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux